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Embriaco, Davide. (2012). Hydrophone dataset (SMID DT-405D(V)1 @ 2 kHz) from INGV/NEMO-SN1 seafloor platform during SMO project in Western Ionian Sea site (East Sicily), part of EMSO network.
No full textThe dataset contains seafloor pressure data acquired by the seismic hydrophone installed on NEMO-SN1 observatory in the frequency band 50mHz - 1kHz. Pressure is sampled at 2kHz rate by two A/D converter (12 bit) which supply two data channel (with low, 30dB and high, 60 dB gain). Pressure data are stored in counts units; 1 count corresponds to 0.546 Pa and 0.0172 Pa for low and high gain channel respectively. Absolute time reference is available thanks to GPS data embedded in each packet of data and distributed from land station to seafloor. The wide frequency range allows to study acoustic ambient noise in the deep water, detect sperm whale and cetaceans and detect seismic signals. It was designed to be able to detect also low frequency hydroacustic signal generated by a tsunami in case this was generated by large seismic event on the seafloor. The set contains 292.5 Gbyte of data stored in 52560 files of ten minutes each and covers 8717.82 hours of acquisition (292.5 days) which was continuous during the mission, excluding some periods when acquisition was stopped for observatory maintenance and calibrations
De Santis, Angelo. (2012). Scalar Magnetometer dataset (Marine Magnetics Sentinel (3000 m) @ 1 sample / hour) from INGV/NEMO-SN1 seafloor platform during SMO project in Western Ionian Sea site (East Sicily), part of EMSO network.
No full textThis sensor is used to measure the total intensity of the magnetic induction vector. The model used is an Overhauser proton magnetometer supplied by GEM. Associated with the SMO 1 - Vector Magnetometer on-board SN1, the Overhauser proton magnetometer completes the magnetic measurement system ensuring reliability of vector data. The main aim of this scalar sensor is the calibration of SMO 1 - Vector Magnetometer data. The data series is complete for this sensor, almost 100% of expected bytes has been recorded
Lo Bue, Nadia. (2012). Current meter dataset (Nobska MAVS-3 @ 2 Hz) from INGV/NEMO-SN1 seafloor platform during SMO project in Western Ionian Sea site (East Sicily), part of EMSO network.
No full textThis sensor performs water current measures in a three axial reference system. Flow velocity and direction is measured by observing the time-of-arrival difference of sound along the acoustic paths. It has also a compass in order to measure the earth's magnetic field, and a tilt sensor to measure the instrument's angle. Using these measurements, the direction of the instrument can be determined and consequently the flow direction
Monna, Stephen. (2012). Hydrophone dataset (OAS E-2PD @ 100 Hz) from INGV/NEMO-SN1 seafloor platform during SMO project in Western Ionian Sea site (East Sicily), part of EMSO network.
No full textTB
Chierici, Francesco. (2012). IMU dataset (LandMark10 IMU @ 100 Hz) from INAF/NEMO-SN1 seafloor platform during SMO project in Western Ionian Sea site (East Sicily), part of EMSO network.
No full textAn IMU works by detecting the current rate of acceleration using one or more accelerometers, and detects changes in rotational papameters like pitch, roll and yaw using one or more gyroscopes
Giovanetti, Gabriele. (2012). DACS dataset (SMO NEMO-SN1 DACS @ 1 Hz) from /NEMO-SN1 seafloor platform during SMO project in Western Ionian Sea site (East Sicily), part of EMSO network.
No full textThe Data Acquisition and Control System is the set of hardware used to acquire and transfer to shore scientific data. It provides power to all the underwater instrumentation. The data generated by DACS are used to monitor the operativity of the system, in order to signal possible malfunctioning, and ease to find their reasons. In the data can be also found information about the status of the platform, that can be useful for scientific data users (i.e. heading and tilt). Data are used mostly for engineering tasks, thus their precision and quality is not a relevant issue
De Santis, Angelo. (2012). Vector Magnetometer dataset (Fluxgate #1 @ 1 sample / 4 sec) from INGV/NEMO-SN1 seafloor platform during SMO project in Western Ionian Sea site (East Sicily), part of EMSO network.
No full textThis sensor provides the three components of the magnetic induction vector in the directions N-S, E-W and Z (vertical). It is a fluxgate prototype developed at INGV laboratories equipped with an inertial platform for levelling control. It provides continuous seafloor magnetic data which are important for two main reasons: a) they extend the magnetic observations from land to the seafloor, improving the spatial distribution in the Italian territory; b) these data are important for the study of short and long magnetic field time variations. The variational data allow us to estimate the resistivity structure underneath the area of observations and possibly to detect some magnetic variations related to some geo-hazards, such as earthquakes and tsunamis. The main aim is the continuous and almost real-time measurement of the three components of the Earth?s magnetic field in a very peculiar environment which in fact has a favorable impact on the quality of the measurements: first, the temperature is more stable at the sea bottom, especially in deep sea sites, so the instrumental drift due to temperature variations is absent or negligible. Second, the water column acts as a natural "shield" to the highest frequencies of the iono- and magnetosphere inducing fields. The data series is almost complete for this sensor: ~96% of expected bytes has been recorded (see problems below). Althougth built with a 0.5 Hz (1 sample / 2 seconds) sampling rate, this sensor began measuring with a sampling rate of 1 sample / 3-5 seconds until September 22, 2012 (21:51:10) when its sampling rate swiched to its proper samplig rate (0.5 Hz) without an apparent reason. Anyway, ~4% of data are missing because the sensor delays erratically its measurements for 4-5 seconds for unknown reasons.
Since timestamp is associated to data after on-shore acquisition with a resolution of milliseconds, it may seem that there exists a mismatch in sampling rate when rounding to seconds, but it is only apparent (compare to Julian date).
A mismatch between the data timestamp (date/hour) and that coming from the sensor (in Julian format) exists since this latter cannot be changed nor adjusted.
Erratically, during on-shore acquisition some data strings are corrupted and this results in gaps.
Recurrent (hourly) spikes are due to the proximity of the SMO Marine Magnetics Sentinel scalar magnetometer (with 1 hour sampling)
Monna, Stephen. (2012). DPG dataset (SCRIPPS-UCSD DPG prototype v6.0 @ 100 Hz) from INGV/NEMO-SN1 seafloor platform during SMO project in Western Ionian Sea site (East Sicily), part of EMSO network.
No full textThis sensor measures the hydrostatic (water column) pressure variation with respect to the pressure value resulting from the pressure of water above its position and the atmospheric air pressure acting on the sea surface
Monna, Stephen. (2012). Seismometer dataset (Guralp CMG-1T @ 100 Hz) from INGV/NEMO-SN1 seafloor platform during SMO project in Western Ionian Sea site (East Sicily), part of EMSO network.
No full textThis digital database comprises seismological data recorded during the SMO project by a 3 component broadband seismometer. The sensor was installed on the the NEMO-SN1 (Neutrino Mediterranean Observatory - Submarine Network 1) seafloor observatory, offshore of the Eastern coast of Sicily (Southern Italy) at a depth of 2036 m. The seismometer is installed in a dedicated vessel integrated in a separate structure connected to the observatory via a special mechanical release. To guarantee a good coupling with the sea bottom, the structure is disconnected just after the observatory touch-down and kept linked to the frame by a slack rope (Favali et al., 2006). The sensor is connected to a 24 bit digitizer on the observatory. The GPS signal is transmitted underwater to the digitizer, so that the data packages are time-stamped locally. This project is a continuation of GNDT 1 and GNDT 2 where the main objective was to establish a multiparameter seafloor observatory off-shore eastern Sicily. One of the main aspects of SMO remains long-term geophysical monitoring and broad-band seismic measurements from this site is of great interest given its proximity to the Etna volcano (~ 50 km) and to offshore seismogenic structures where some of the most destructive earthquakes in Italy took place (some of them generated tsunamis). For this reason a tsunami detection systems is implemented on-board the observatory and the seismometer is an important component. The Z (vertical) and N components have recorded data of good quality for the duration of the deployment. The E component recorded only electronic noise from the beginning of the experiment till the 24th of August (~9 UTC) due to the fact that the mass was not released. After we were able to release the mass the E component recorded good quality signal for the rest of the mission. Due to tests, during June 2012, there are periods with electronic disturbances and presence of gaps in the data. A periodic disturbance is visible on all components due to the acoustic signal emitted when the ADCP is sampling (2 profiles/hour)
Lo Bue, Nadia. (2012). CTD dataset (SBE 37-SM @ 1 sample / hour) from INGV/NEMO-SN1 seafloor platform during SMO project in Western Ionian Sea site (East Sicily), part of EMSO network.
No full textThe dataset contains sea bottom Conductivity, Temperature and Pressure data (about 1 m above the bottom) acquired through a SBE 37-SM installed on SN-1 station. CTD is used in order to monitoring possible variations of bottom sea water masses in the area